Flexible armored hose



July 21s;v 1931. C F. OGREN 1,816,740

' .FLEXIBLE ArmoRED HosE y Filed oct. 29. 1929 y //Qyf'err/ y aise/Q Mya y fmm/ rented July 2s, 1931 UNITED STATES PATENT iti-ica CARL IF. OGREN, DE TBENTON, NEW JERSEY, ASSIGNOB T0 THERMOID :RUBBER C01!!-` PANY, OF TRENTON, NEW JERSEY, A. CORPORATION OF .NEWJEBSEY FLEXIBLE ARMOBED HOSE Application led October 29, 1929. Serial No. 403,284.

This invention relates to im rovements in armored hose, and one object o the invention is to provide hose of this type, in which provision is made for preventing abrasion of the outer surface of the tube which constitutes the hose proper by the metallic or other armor.

Another object of the invention is to provide hose of the stated type having a superior exibility.

In the attached drawings:

Figures l, 2, and 3 are sectional views o1" fragments of hose, illustrating successive ste s in the process of manufacture; and

ig. 4 is a side view illustrating the finished article.

With referenceto the drawings:

1 is a section of a known type of rubber hose, this hose being made up of a plurality of layers of rubberized fabric 2, and inner and outer sheaths or facings, 3 and 4, of

vulcanized rubber.

It is customary in armoring hose of this type to form the armor by means of metallic wires 5 wound spirally upon the outer sheath 4. These wires in a desirable form` are halfround in cross-section, as illustrated, and in one type of sheathing two of such wires are used, one being applied in an open helix with the rounded surface contacting with the outer sheath 4, as shown in Fig. 1, and the other being wound helically in the spaces between the convolutions of the first wire but being reversed so that the flat side lies against the rubber sheat. This arrangement of wires affords a continuous metallic armor surrounding the hose, and also aiords a desirable flexibility.

One disadvantage .of the aforedescribed construction resides in the fact that the sharp corners of that one of the wires which is laid flat against the sheath has a tendency to abrade and gradually destroy the latter, particularly where the hose is subjected to considerable or continuous flexing. I have discovered means whereby this abrading action may be entirely eliminated, said means alsoincreasing the iiexibility of the armored hose. In formin'g'a hose in accordance with my invention, I- may apply one of the armor wires 5in an open helix as shown in Fig. l, with the rounded side of the wire in contact with the sheath 4. Thereater, and as shown in Fig. 2, I lay' in the space between the convolutions, a strip of uncured rubber 6, this strip being of a width substantially illing the space between the convolutions and referabl beingin thickness about one-hal of the t ickness of the said wire.

Following insertion of the rubber strip 6, the hose is subjected to a vulcanizing operation which thoroughly incorporates the rubber strip 6 with the sheath 4 and makes them in elfect an integral body. This vulcanizing operation also cures the rubber strip Gand v gives it the desired lexibilit i and strength.

Thereafter as shown in ig. 3, I apply a second wire 7 within the space between the wires 5, and directly upon the inserted rubber 6. This gives a construction substantially as shown in Fig. 3.

It will now be apparent ythat the flat or inner side of the wire 7 is elevated from the normal outer surface of the sheath 4 by the inserted rubber stri 6 and that the sharp edges thereof are accordingly prevented, regardless of the degree of lexure of'the .hose within reasonable limits, from coming into abrading contact with any part of the outer rubber surface'. At the same time, by reason of thereduced area of contact between the adjacent wires 5 and 7, the flexibility of the hose is materially increased. A hose constructed in accordance with the aforedescribed procedure Ahas been found to possess a relatively high durability.

It is to be noted that the invention is not limited to the' exact process of manufacture described above. The` helical strip '6 of rubber may, for exampleb e laid rior to the windingo the'VWire 5, Vor in act may be formed as an integral part of the sheath 4.

I claim:

1. A conduit of relatively soft abradable material, having a surface projection in the form of an open helix and means for shielding the outer Vsurface of said conduit, comprising` helical metallic wires wound respectively upon and between successive convolutions of said projection.

. 2. A flexible rubber hose having on its outer surface a projection in the form of an open helix extending completely around the hose in successive convolutions, a half-round wire wound upon the hose intermediate thel convolutions of said helical projection, the curved surface of said half-round wire normally lying in contact with the surface ofthe hose, and a second half-round wire wound between the convolutions of the' first-named wire and with its flat side seated upon the said helical projection, said wires together forming a substanf' tially continuous armor for the hose.

3. A conduit of relatively soft abradablel material having a superficial armor consisting of helical. convolutions of a pair of metallic strands of approximately half lround section, the convolut1ons of one strand lying contiguous to the convolutions of the other, and said strands being in relativelyvinverted ositions whereby the rounded surfaces face 1n o p osite directions, and a helically formed sur ace projection on the conduit constituting a seat for the flat side of one of said 4strands and efecting a relative radial displacement of the strands.

l4. A conduit ofrelatively soft abradable material having a superficial armor consisting of helical convolutions of a pair of metallic strands of approximately half round section,

' the convolutlons of one strand lying contiguous to the other, and the strands being in relatlvely inverted positions whereby the rounded surface of one of saidstrands and the flat surface of the other engage the outer surface of the conduit, and said strands being radially offset with res ct to each other.

. F. OGREN. 

